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<DIV><SPAN class=202165505-30052003>Hi Larry....good work!</SPAN></DIV>
<DIV><SPAN class=202165505-30052003>That problem with the mold flash is pretty
well known and while not a problem on every unit, it does happen a lot.
Another thing that will cause the same problem is metal debris inside the
hole in the regulator housing that the plunger shaft goes through...the debris
jams the plunger shaft and holds open the valve causing pressurized fuel to pour
out of the carb and/or fill up the engine too.</SPAN></DIV>
<DIV><SPAN class=202165505-30052003></SPAN> </DIV>
<DIV><SPAN class=202165505-30052003>Sorry I can't make it to Dayton this weekend
as I'll be flying in California.....but I'll be wearing a hardhat
too!!</SPAN></DIV>
<DIV><SPAN class=202165505-30052003></SPAN> </DIV>
<DIV><SPAN class=202165505-30052003>Have Fun!</SPAN></DIV>
<DIV><SPAN class=202165505-30052003></SPAN> </DIV>
<DIV><SPAN class=202165505-30052003>Dave NSRCA 586</SPAN></DIV>
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<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org] <B>On
Behalf Of </B>jed241@msn.com<BR><B>Sent:</B> Thursday, May 29, 2003 10:12
PM<BR><B>To:</B> NSRCA<BR><B>Subject:</B> Re: Need help with YS 63 &
Dayton, OH Contest...<BR><BR></FONT></DIV>
<DIV>Never got a reply on the e-mail below, but I think I found an interesting
problem. This may also apply to some of the other YS problems with leaking
fuel through the carb. I believe the part is either the same or
similar.</DIV>
<DIV> </DIV>
<DIV>I pulled the regulator body apart and didn't find any debris. It was very
clean. After taking each piece apart and carefully inspecting for
any defects, I noted that the silicon seal that the plunger fits into,
and the spring fits on, may have caused the leak. Not due to damage or wear,
but poor quality control of the molding operation.</DIV>
<DIV> </DIV>
<DIV>Around the outer edge, you can see thick flashing. When I set this in the
regulator body and looked very close when applying force to the spring, there
is an interference that would prevent proper sealing of the seat. The
interference is the flashing hitting the regulator body and preventing the
proper seal in the hole to the plunger.</DIV>
<DIV> </DIV>
<DIV>I trimmed the flashing off and put it back together. Engine is better
than ever and no more leaking.</DIV>
<DIV> </DIV>
<DIV>This makes sense as a brand new part could seal when new. After a few
flights and getting broke in, then the flashing prevents a good seal. The
only way to recover this would to increase the spring tension by screwing in
the adjustment screw to apply more force on the spring for the
seal.</DIV>
<DIV> </DIV>
<DIV>Has anybody else seen this problem?</DIV>
<DIV> </DIV>
<DIV>Engine is working fine now, so I guess I have to make my first
contest in Dayton, OH this weekend. After practicing in a cross wind, I
think I'm going to get my own hard hat just in case…<VBG> Should be at
the field around 5pm. I will need much help in trimming the plane. Didn't get
allot of flying time with the weather in southern Indiana… If anyone is going
to stay at a Holiday Inn let me know. I think I can get a military discount
for any rooms I pay for (you would have to give me the money though ;^)
Military rates are often the best rates Holiday Inn offers.</DIV>
<DIV> </DIV>
<DIV>See ya,</DIV>
<DIV> </DIV>
<DIV>Larry<BR></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial"><B>From:</B> <A title=jed241@msn.com
href="mailto:jed241@msn.com">jed241@msn.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">NSRCA</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, May 26, 2003 5:12
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Need help with YS 63</DIV>
<DIV><BR></DIV>
<DIV
style="FONT-WEIGHT: normal; FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Verdana">
<DIV>The engine started leaking fuel through the carb just dripping out and
floods. It just started doing this. Tank pressure is good. I only have about
10 flights on this engine and today is the first time it refused to
start.</DIV>
<DIV> </DIV>
<DIV>I checked the diaphram in the regulator and it is in good shape.</DIV>
<DIV> </DIV>
<DIV>Thanks for your help….</DIV>
<DIV> </DIV>
<DIV>Larry<BR></DIV></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>